Centrifugal bowl



March 1 1927. 1,619,347

L.- D. JONES .ET AL CENTRIFUGAL BOWL Filed Sept. 4. 1925 2 Sheets-SheetInventors leap-Jones 3E5" uabrney'.

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L. D. JONES ET AL CENTRIFUGAL sown Filed Sept. 4. 19:25

2 Shuts-Sheet 2 Patented Mar. 13.1927.

1,619,347 1 UNITED STATES-PATENT OFFICE.

LEO D. JONES AND ARTHUR U. AYBES, OF PHILADELPHI A, PENNSYLVANIA, AS-SIGNORS TO THE SHARPLES SPECIALTY COMPANY, OI PHILADELPHIA, PENNSYL-VANIA, A CORPORATION OF DELAWARE.

CENTRIFUGAL BOWL.

Application flledseptember 4, 1925. Serial No. 54,477.

Our improvements are designed to provide means for securing heads or endclosures to the shells of bowls of centrifugal machines so as toeffectively seal the joints between the parts and secure coincidence andalignment of the axes of the closures with the axes of the bowl.

Leading objects of our invention are to obviate the play and loss ofalignment between a bowl and its head; to avoid leakage incident to theuse of usual threaded, welded or packed joints; to avoid the melting,deterioration or displacement of solder or of packing commonly used; andto avoid the shell distortion and bowl wabbling incident to the use ofprevious joints.

In the preferred embodiment of our improvements, a threaded jointisformed between the shell and closure, and a surface of the thread onone member is drawn into close contact with the surface of a thread onthe other member; such contact being preferably effected bythe'engagement of bearings on the respective members having contactingsurfaces normal to the axis of the bowl. The engagement of such bearingsurfaces also effects and maintains the alignment or parallelism of theaxes of the bowl and closure, this function of the bearing surfaces beinof particular importance when the axia contact between the shell andclosure is comparatively short, viz, less than the shell diameterJ Theclosure has formed thereon,on the opposite sides of its screw thread,cylindrical surfaces concentric with the axis of the bowl and engagingthe shell wall to guide ,and steady the closure and assist inmaintaining the rigidity of the joint and the alignment of the closureaxis with the axis of the shell. The outer terminus of the intersticebetween the shell and closure is sealed by packing compressed by a clampsecured to one of the mem ers.

' The characteristic features and advanenlarged fragmentary view of the.joint formed between the bowl shell and its closure; and Fig. 4 is afragmentary view showing the sealing gasket and channel therefor.

As illustrated inthe drawings, the frame A carries a bearing B on whichis journalled a power driven pulley C having depending therefrom aflexible s indle D from which the bowl J!) is suspen ed. The mixture tobe centrifuged is introduced into the-bottom of the bowl through thefeed' nozzle F and the separated constituents are discharged throng? thetop of the bowl to the covers G and provided with suitable dischargespouts.

In accordance with our invention, the bowl top 1 has its lower portionor body 2 provided with a helical rib forming truncated externalthreads-4, and the upper part of the internal wall of the shell 3 isgrooved to provide a helical rib forming threads 5 complementary to thethreads 4. The top 1 and shell 3 are respectively provided withcomplementary bearmgs or shoulders 6 and 7 having surfaces normal to theaxis of the bowl, the surface of the shoulder 6 being spaced from thenearest thread 4 a suitable distance, preferably greater than the baseor width of such 'thread,and the surface 7 being spaced from the nearestthread 5 a suitable distance, preferably greater than the width or baseof such thread. The en agement of the bearing surfaces 6 and% byscrewing together the parts 1 and 3 draws into close contact thecomplementary surfaces 4 and 5' of the threads 4 an'd 5, thereby forminga tight joint which cannot be obtained when the threads of one part areallowed to lie in their normal position in the channel between thethreads of the other part. The engagement of the bearing surfaces 6 and7 also maintains. in alignment the axes of the shell and its closure,which are brought into coincidence bythe cylindrical surfaces 8 and -8'.The cylindrical surface 8 is formed on the closure 2'below the thread 4,and has a peripheral surface concentric with the bowl axis and makes aclose slip fitwith the inner cylindrical -wall of the shellbelow thethread 5. The cylindrical "surface 8' is, formed on the closure 2 abovethe thread 4, and its ppri heral. surface is concentric with the ow axisand bearing 12 formed in the shell above the thread 5.

The interstice between the bearing surfaces 8 and 12 is sealed by anelastic packing, such as a rubber gasket 11, seated in the annularchannel 9 formed by complementary grooves in the closure and shell, thepacking being firmly seated in the channel and against the annularlyscored or indented bottom 10 thereof by a clamp comprising a collar 13screwed on the threaded boss 14 of the bowl neck and a peripheral flangeor ring 15 registering with and compressing the gasket.

It will be understood that in assembling the bowl, the head 2 is slippedin the shell 3, the pilot 8 forming a guide for effecting the properengagement of the threads 4 and 5. The relative rotation of the parts 1and 3 brings the bearing surfaces 6 and 7 into con-.

tact, and thereby brings the threaded surfaces 4 and 5 into closeengagement. The disengagement of the shell and head may be prevented byengaging a stud or screw there in. The packing or gasket 11 is thenplaced in the channel 9 and compressed therein by the clamp 15 byscrewing the collar 13 down on the boss 14. A joint so formed is devoidof the play which results from the insertion of an elastic packingbetween the metallic surfaces forming the joint, andthe packing isprotected from the effects of hot and heavy substances flowing throughthe bowl.

The bowl head may be provided with a plurality of suitable efliuentpassages, such as indicated at 16, and the bowl is so de signed as torotate on a vertical axis and be supported and driven entirely throughits head. By our construction, the torque and thrust of the rapidlyrotating bowl are transmitted directly between metallic bearing surfacesof the shell and head, with avoidance of side sway of the bowl, orleakage of the substance undergoin centrifugal treatment.

It will of course be understood that the joint between the shell and itsbottom closure may be made in the same way as is here in described withreference to the-shell'and its top closure.

Having described our invention, We claim:

1. A centrifuge bowl comprising a shell and a head having complementaryscrew threads and a gasket sealing the external terminus of theinterstice between said shell and head.

2. A centrifugal bowl comprising a shell and a head, a gasket sealingthe external terminus of the interstice between said shell and head, anda clamp having a threaded connection with one of said members andpressing said gasket.

3. A centrifugal bowl comprising a shell having a thread therein; a headhaving a pilot engaging the inner wall of said shell, a thread engagingthe thread of said shell, and a bearing surface normal to the axis ofthe bowl and engaging a complementary surface of said shell; said shelland head having grooves therein forming a channel; a gasket seated insaid channel; and means for pressing said gasket in said channel. 4. Acentrifuge bowl comprisin a shell and a head forming a channel liaving ascored bottom, a gasket seated in said channel and means for pressingsaid gasket against said bottom.

.5. A centrifuge bowl comprising a shell and a head, packing sealing thejoint be tween said shell and head, and a clamp threaded on an outerwall of one of said members and pressing said packing against saidjoint.

6. A centrifugal bowl comprising'a shell having a head sleeved inan endthereof, a packing sealing the external terminus of the intersticebetween said shell and head and a ring sleeved on said head and pressingsaid packing.

7. A .centrifuge bowl comprising a shell and a head, one of said membersbeing threaded into the other, a gasket sealing the joint between saidmembers, and a clamp connected with one of said members and forcing saidgasket in place.

8. A centrifuge comprising a dependingdriven spindle, a head suspendedfrom said shaft, and a shell suspended from said head, said shell andhead having complementary engaging screw threads, and a gasket exteriorto said shell and sealing the joint between said shell and head.

In testimony whereof we have hereunto set our names this 31 day of Aug,1925.

LEO D. JONES. ARTHUR U. AYBES.

